So after weeks of tearing apart my driver side cabin, I've ruled out all causes of my slight rattle except the door seals. It appears the solution is using Carbaflo KSP105 on the door seal. Now, if only it was easy and cheap to try this solution. It appears you have to buy it online and it costs something like $50.

Does anyone have a cheaper hookup or have a tube that has just a little that I can test with? Of course, I will pay you for it.